Frequencies for first 10,000 rows of pct012k034 variable in sf12010880us30 dataset :

   31 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,324       93.24       93.24
          1 |        528        5.28       98.52
          2 |        102        1.02       99.54
          3 |         30        0.30       99.84
          4 |          9        0.09       99.93
          5 |          4        0.04       99.97
          6 |          1        0.01       99.98
          8 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017